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d15b vs d15b7

Discussion in 'Engine Building' started by 94tuner, Jul 22, 2011.

  1. 94tuner

    94tuner New Member

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    ok i have a 92 hatch with a jdm d15b. I also have a hatch as a parts car and it has a d15b7. I know obviously the b7 is non vtec and the b is. But my question is there a difference in the blocks? If the blocks are the same i was going to rebuild the b7 so that way i could still drive everyday and just put the b head on when i swap. Thanks.
     
  2. AHHVTEC

    AHHVTEC Well-Known Member VIP

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    yes you can put the d15b head on the b7
     
  3. K2e2vin

    K2e2vin Senior Member

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    The actual blocks are the same, but the components inside are different: The D15B VTEC crankshaft is fully counter-weighted(also makes it heavier) and has larger rod journals(D16-sized) along with "D16 rods" and specific 27mm compression height pistons. The water pump is also different; the JDM motor uses D15Z1-style water pump.
     
  4. 94tuner

    94tuner New Member

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    So would i lose power by putting the vtec head on the b7 block vs the b block?
     
  5. K2e2vin

    K2e2vin Senior Member

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    Depends on the tuning, but the non-VTEC block should have higher compression compared to a stock D15B. I haven't tried this but the main concern is that valve relief/piston-valve clearance(probably not an issue with stock cams).
     
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  6. mykorn

    mykorn New Member

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    how about intake manifold for both d15b vtec & non-vtec? is it same?
     
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